1 /* 2 * index.h - Defines for NTFS index handling. Part of the Linux-NTFS project. 3 * 4 * Copyright (c) 2004 Anton Altaparmakov 5 * Copyright (c) 2004-2005 Richard Russon 6 * Copyright (c) 2005-2006 Yura Pakhuchiy 7 * Copyright (c) 2006 Szabolcs Szakacsits 8 * 9 * This program/include file is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License as published 11 * by the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program/include file is distributed in the hope that it will be 15 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty 16 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program (in the main directory of the Linux-NTFS 21 * distribution in the file COPYING); if not, write to the Free Software 22 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 */ 24 25 #ifndef _NTFS_INDEX_H 26 #define _NTFS_INDEX_H 27 28 #include "attrib.h" 29 #include "types.h" 30 #include "layout.h" 31 #include "inode.h" 32 #include "mft.h" 33 34 #define VCN_INDEX_ROOT_PARENT ((VCN)-2) 35 36 #define MAX_PARENT_VCN 32 37 38 /** 39 * struct ntfs_index_context - 40 * @ni: inode containing the @entry described by this context 41 * @name: name of the index described by this context 42 * @name_len: length of the index name 43 * @entry: index entry (points into @ir or @ib) 44 * @data: index entry data (points into @entry) 45 * @data_len: length in bytes of @data 46 * @cr: 47 * @is_in_root: TRUE if @entry is in @ir or FALSE if it is in @ib 48 * @ir: index root if @is_in_root or NULL otherwise 49 * @actx: attribute search context if in root or NULL otherwise 50 * @ia_na: opened INDEX_ALLOCATION attribute 51 * @ib: index block if @is_in_root is FALSE or NULL otherwise 52 * @ib_vcn: VCN from which @ib where read from 53 * @ib_dirty: TRUE if index block was changed 54 * @parent_pos: parent entries' positions in the index block 55 * @parent_vcn: entry's parent nodes or VCN_INDEX_ROOT_PARENT for root 56 * @max_depth: number of the parent nodes 57 * @pindex: maximum it's the number of the parent nodes 58 * @block_size: index block size 59 * @vcn_size_bits: VCN size bits for this index block 60 * 61 * @ni is the inode this context belongs to. 62 * 63 * @entry is the index entry described by this context. @data and @data_len 64 * are the index entry data and its length in bytes, respectively. @data 65 * simply points into @entry. This is probably what the user is interested in. 66 * 67 * If @is_in_root is TRUE, @entry is in the index root attribute @ir described 68 * by the attribute search context @actx and inode @ni. @ib, @ib_vcn and 69 * @ib_dirty are undefined in this case. 70 * 71 * If @is_in_root is FALSE, @entry is in the index allocation attribute and @ib 72 * and @ib_vcn point to the index allocation block and VCN where it's placed, 73 * respectively. @ir and @actx are NULL in this case. @ia_na is opened 74 * INDEX_ALLOCATION attribute. @ib_dirty is TRUE if index block was changed and 75 * FALSE otherwise. 76 * 77 * To obtain a context call ntfs_index_ctx_get(). 78 * 79 * When finished with the @entry and its @data, call ntfs_index_ctx_put() to 80 * free the context and other associated resources. 81 * 82 * If the index entry was modified, call ntfs_index_entry_mark_dirty() before 83 * the call to ntfs_index_ctx_put() to ensure that the changes are written 84 * to disk. 85 */ 86 typedef struct { 87 ntfs_inode *ni; 88 ntfschar *name; 89 u32 name_len; 90 INDEX_ENTRY *entry; 91 void *data; 92 u16 data_len; 93 COLLATION_RULES cr; 94 BOOL is_in_root; 95 INDEX_ROOT *ir; 96 ntfs_attr_search_ctx *actx; 97 ntfs_attr *ia_na; 98 INDEX_BLOCK *ib; 99 VCN ib_vcn; 100 BOOL ib_dirty; 101 int parent_pos[MAX_PARENT_VCN]; 102 VCN parent_vcn[MAX_PARENT_VCN]; 103 int max_depth; 104 int pindex; 105 u32 block_size; 106 u8 vcn_size_bits; 107 } ntfs_index_context; 108 109 extern ntfs_index_context *ntfs_index_ctx_get(ntfs_inode *ni, 110 ntfschar *name, u32 name_len); 111 extern void ntfs_index_ctx_put(ntfs_index_context *ictx); 112 extern void ntfs_index_ctx_reinit(ntfs_index_context *ictx); 113 114 extern int ntfs_index_lookup(const void *key, const int key_len, 115 ntfs_index_context *ictx); 116 117 extern int ntfs_index_add_filename(ntfs_inode *ni, FILE_NAME_ATTR *fn, 118 MFT_REF mref); 119 extern int ntfs_index_rm(ntfs_index_context *ictx); 120 121 extern INDEX_ROOT *ntfs_index_root_get(ntfs_inode *ni, ATTR_RECORD *attr); 122 123 extern VCN ntfs_ie_get_vcn(INDEX_ENTRY *ie); 124 125 extern char *ntfs_ie_filename_get(INDEX_ENTRY *ie); 126 extern void ntfs_ie_filename_dump(INDEX_ENTRY *ie); 127 extern void ntfs_ih_filename_dump(INDEX_HEADER *ih); 128 129 extern void ntfs_index_entry_mark_dirty(ntfs_index_context *ictx); 130 131 #endif /* _NTFS_INDEX_H */ 132